Extreme Optical Chirality from Plasmonic Nanocrystals on a Mirror

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-01-13 DOI:10.1021/acs.nanolett.4c0566810.1021/acs.nanolett.4c05668

Yidong Hou*, Xiu Yang, Shu Hu, Qianqi Lin, Jie Zhou, Jialong Peng, Chenyang Guo, Shanshan Huang, Liangke Ren, Ana Sánchez-Iglesias, Rohit Chikkaraddy* and Jeremy J. Baumberg*,

引用次数: 0

Abstract

Metal nanocrystals synthesized in achiral environments usually exhibit no chiroptical effects. However, by placing nominally achiral nanocrystals 1.3 nm above gold films, we find giant chiroptical effects, reaching anisotropy factors as high as g ≈ 0.9 for single nanodecahedra placed on a gold mirror (NDoM). We show that this is a general phenomenon depending on the geometry, demonstrating it for various nanocrystal shapes. Theoretical modeling reveals that tiny chiral imperfections are strongly enhanced by edge modes in the gap, which coherently superpose with in-plane dipoles to generate strong chiroptical signatures. This phenomenon results in photonic spin Hall effects and distinctive chiral scattering patterns.

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镜面上等离子体纳米晶体的极端光学手性

在非手性环境下合成的金属纳米晶体通常没有热效应。然而，通过在金膜上方1.3 nm处放置名义上的非手性纳米晶体，我们发现了巨大的热效应，对于放置在金镜（NDoM）上的单个纳米十面体，各向异性因子高达g≈0.9。我们证明了这是一种普遍的现象，取决于几何形状，证明了它适用于各种纳米晶体形状。理论模型表明，微小的手性缺陷被间隙中的边缘模式强烈增强，边缘模式与平面内偶极子相干叠加产生强的手性特征。这种现象导致光子自旋霍尔效应和独特的手性散射模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.